The 1991 Porsche 928 sits in the final stretch of Porsche’s front-engine grand touring development, blending V8 power, long-distance comfort, and unmistakably late-1980s to early-1990s German styling. It is a car that rewards careful attention to chassis balance, and its tire fitment reflects that. This model uses a staggered 16-inch radial setup, with 225/50R16 at the front and 245/45R16 at the rear. That makes the real decision less about finding a vintage-style substitute and more about choosing the right modern radial within the correct front and rear sizes. Owners should confirm position-specific fitment, wheel specs, and overall condition before putting the car back into regular road use.
Which Tire Size Is Right for The 1991 Porsche 928
The 1991 Porsche 928 uses two primary tire sizes, and they are position-specific rather than interchangeable. Both are metric radial sizes on 16-inch wheels, with 225/50R16 used at the front and 245/45R16 used at the rear. The first step is confirming whether you are replacing front tires, rear tires, or a full set, because the staggered layout shapes both fitment and handling.
In 225/50R16, the 225 is the nominal section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 16 is the wheel diameter in inches. On the 1991 Porsche 928, this is the front tire size and is part of the car’s staggered radial setup. Available choices in this size include Blackwall radials from BFGoodrich and Michelin across series such as g-Force Sport Comp 2, g-Force Comp 2 AS, and Pilot Sport. This is the size to focus on when preserving the intended front-end fitment and steering balance of the car.
In 245/45R16, the 245 is the nominal section width in millimeters, 45 is the aspect ratio, R marks radial construction, and 16 is the wheel diameter in inches. On the 1991 Porsche 928, this size is used at the rear, where the wider tire complements the car’s staggered fitment. Because front and rear sizes differ, this rear specification should be matched carefully to the actual wheel and axle position on the car. It is the size to verify when replacing rear tires or checking whether the car still retains its proper 16-inch staggered setup.
Sub-model fitment is consistent in pattern, with both covered versions using the same staggered front and rear tire arrangement. Checking the exact sub-model still matters so the front and rear positions are matched correctly when replacing individual tires or a full set.
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1991 Porsche 928 Base Front
The 1991 Porsche 928 Base Front uses the 225/50R16 radial size on a 16-inch wheel. That makes front-tire selection a matter of staying with the correct metric radial fitment and comparing available Blackwall choices by brand, series, and wheel compatibility.
The 1991 Porsche 928 Base Rear uses the wider 245/45R16 radial size on a 16-inch wheel. Rear-tire replacement should be handled as a position-specific fitment, especially on a staggered car where front and rear sizes are not meant to be mixed.
The 1991 Porsche 928 GT Front uses the same 225/50R16 radial size as the Base front position. That keeps the front fitment straightforward, but the tire still needs to be selected as part of a matched staggered setup rather than as a universal size for all four corners.
The 1991 Porsche 928 GT Rear uses 245/45R16 radial tires at the back. For tire selection, that means confirming the rear wheel position first and then matching the size to the car’s wider rear fitment and existing wheel setup.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1991 Porsche 928 Tires for Sale
Available 225/50R16 choices center on modern Blackwall radials from BFGoodrich and Michelin. The product grid highlights differences in tire series, rim-width compatibility, weight, and construction details that matter when selecting a front tire for a staggered 1991 Porsche 928 setup.
These FAQs focus on the staggered front and rear tire sizes used on the 1991 Porsche 928, along with wheel fitment, product selection, maintenance, and the checks that matter before returning a grand touring Porsche to regular road use.
Tire Size & Fitment
What tire size fits a 1991 Porsche 928?
The 1991 Porsche 928 uses a staggered radial tire setup with 225/50R16 at the front and 245/45R16 at the rear. Both sizes fit 16-inch wheels, but they serve different positions on the car and should not be treated as one universal four-corner size.
That means the first step is identifying whether you are replacing front tires, rear tires, or all four. On a 928, the staggered layout is part of the overall chassis package, so wheel diameter, actual wheel width, and clearance should be checked carefully if the car has been modified or no longer has its original wheel arrangement.
What size rim does a 1991 Porsche 928 use?
The 1991 Porsche 928 uses 16-inch rims with its primary tire sizes. Both 225/50R16 and 245/45R16 are built around a 16-inch wheel diameter, so the rim diameter remains the same even though the front and rear tire sizes differ.
Rim diameter is only one part of the fitment picture. A 16-inch wheel still needs the right width and overall setup for the specific front or rear tire being installed, especially on a staggered car, so it is wise to confirm the actual wheel dimensions before mounting replacement tires.
Do all 1991 Porsche 928 sub-models use the same tire size?
The covered 1991 Porsche 928 sub-models share the same fitment pattern rather than the same single size. Both the Base and GT use 225/50R16 on the front and 245/45R16 on the rear, so the distinction is really tire position, not a separate sub-model-only tire package.
That makes replacement simpler than on a model with multiple wheel packages, but front and rear still need to be kept straight. A buyer should confirm axle position before ordering, and any car with aftermarket wheels or previous tire substitutions should have its current setup checked before selecting replacements.
Choosing the Right Tire
What should I consider when choosing a 225/50R16 tire for a 1991 Porsche 928?
The key points are correct front-position size, radial construction, 16-inch rim compatibility, and the character of the tire itself. In 225/50R16, available choices include BFGoodrich and Michelin Blackwall radials in series such as g-Force Sport Comp 2, g-Force Comp 2 AS, and Pilot Sport.
Selection usually comes down to matching the tire to the car’s use and existing setup. Compare rim-width suitability, construction details, and product weight where relevant, then consider whether the car is driven mostly for touring, occasional spirited use, or light collector mileage rather than choosing by name alone.
What sidewall styles are available for 1991 Porsche 928 tires?
The available 225/50R16 products for the 1991 Porsche 928 use a Blackwall sidewall style. That gives the car a clean, modern performance-tire appearance that suits the 928’s late-model grand touring character without introducing a vintage-style sidewall treatment.
Sidewall style matters mostly for appearance, but it should still be chosen within the correct size and position. On this application, the larger decision is usually not decorative sidewall variation but selecting the right front tire series and confirming that the overall front and rear setup remains consistent with the car’s staggered layout.
What brands offer tires for the 1991 Porsche 928?
For the available 225/50R16 front fitment, the 1991 Porsche 928 has choices from BFGoodrich and Michelin. Those products are offered in Blackwall radial form, with series including BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Comp 2 AS, and Michelin Pilot Sport.
Brand alone should not drive the decision. It makes more sense to compare the specific tire series, the intended use of the car, and the wheel compatibility of the tire you are considering, while also keeping the 928’s separate front and rear sizes in mind when planning a complete tire replacement.
Restoration & Appearance
Which tire should I choose for a period-style 1991 Porsche 928?
A period-style approach on a 1991 Porsche 928 starts with keeping the correct staggered radial sizes in place: 225/50R16 at the front and 245/45R16 at the rear. Because this is a modern grand touring Porsche rather than an earlier bias-ply-era car, the right visual foundation comes from correct metric radial sizing and proper wheel fitment.
Appearance then becomes a matter of choosing a tire that suits the car’s late-classic character without disturbing the intended stance. Blackwall tires are available in the front size, and buyers focused on originality should compare the current wheel-and-tire package against marque-specific references before making cosmetic changes.
Does correct tire fitment matter for a 1991 Porsche 928 restoration?
Correct tire fitment matters on a 1991 Porsche 928 because the car relies on a staggered front-and-rear arrangement rather than one uniform size. Keeping the proper 225/50R16 front and 245/45R16 rear sizing helps preserve the visual balance of the car and keeps the wheel openings from looking mismatched.
Restoration-minded owners should also pay attention to construction type, wheel diameter, and sidewall presentation. Even when the goal is mainly appearance, the tire still needs to suit the actual wheel on the car, so any previous wheel change or suspension alteration should be checked before finalizing a restoration-oriented tire choice.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 Porsche 928?
Yes, modifications can affect tire fitment on a 1991 Porsche 928 even when the replacement tire size itself is correct. Changes such as aftermarket wheels, altered wheel width, suspension lowering, or body modifications can change how a 225/50R16 front or 245/45R16 rear tire sits in the wheel opening.
A staggered car is especially sensitive to setup changes because front and rear tires already differ by design. Any modified 928 should have wheel dimensions, clearance at full steering lock, suspension travel, and the overall front-to-rear arrangement checked before new tires are installed or before a mixed setup is continued.
What should I inspect before driving a 1991 Porsche 928 on new tires?
Start by confirming that the correct front and rear sizes have been installed in the proper positions and that the tires match the 16-inch wheel diameter. It is also wise to inspect wheel condition, valve stems, inflation pressure, and the general condition of suspension and steering components before regular road use.
A 928 that has seen storage or low annual mileage deserves an extra look at alignment, brake condition, and any signs of rubbing or interference once the new tires are mounted. A short initial drive followed by a recheck of pressure and visible clearance can catch setup issues before they become more serious.
How should tires on a collector 1991 Porsche 928 be maintained?
Collector-car tire care for a 1991 Porsche 928 starts with regular pressure checks, routine visual inspection, and attention to age-related condition even if tread wear is low. Sidewall cracking, bulges, cuts, uneven wear, and slow air loss all deserve prompt attention on a low-use grand touring car.
Storage habits matter as much as mileage. Keeping the car away from prolonged sunlight, moisture, heat, and ozone sources can help protect the tires, and moving or driving the car periodically can reduce long static loading. Front and rear tires should also be inspected with their different sizes in mind rather than as a generic set.
